Abstract
In this paper, an ultra wide band (UWB) low noise amplifier (LNA) circuit with a new input stage is proposed. In this scheme, a combination of coupled inductors in the input stage is utilized. The input stage is able to easily reject out-band interference. This input stage is applied in an LNA with 0.18 μm technology. The LNA has a peak gain of 21.72 dB in 3.1-10.6 GHz frequency band while showing a minimum noise figure of 1.85 dB in the mentioned frequency band. This circuit rejects 15.2 dB out-band interference, while power consumption of the UWB LNA core is 11.8 mW DC which is supplied from a 1.8 V power supply. s11 is less than -10.3 dB over the entire bandwidth since the worst value of IIP3 over the entire bandwidth is -13 dBm, which occurs at the frequency of 10.6 GHz.
Highlights
ultra wide band (UWB) standard was proposed by the federal communication committee (FCC)[1] in frequency range of 3.1-10.6 GHz
Due to the wide frequency band, UWB systems are capable of increasing the transmission rate up to 450 Mbps[2, 3]
One of the major challenges associated with these systems is the presence of interferer signals in the mentioned frequency range which can cause destructive effects on received UWB signal
Summary
UWB standard was proposed by the federal communication committee (FCC)[1] in frequency range of 3.1-10.6 GHz. The first category mainly causes in-band interference and is a result of WLAN systems which works under IEEE 802.11a standard and takes in the frequency range of 5-6 GHz. The other category is related to WLAN systems working under IEEE 802.11 b/g standard. The other category is related to WLAN systems working under IEEE 802.11 b/g standard This kind of interference is called out-band interference, due to occupying the frequency band of 2.4-2.48 GHz. The high power interference signal caused by these systems may saturate the UWB LNA receivers and degrade the sensitivity of the system. The high power interference signal caused by these systems may saturate the UWB LNA receivers and degrade the sensitivity of the system Removing this type of interference is considered as a crucial issue in designing RF transceivers. The performance of UWB transceivers can be guaranteed by more than 15 dB rejection
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